A Saudi inventor’s proposal to insert semiconductors subcutaneously in visitors and remotely kill them if they misbehave will not be patented in Germany.

On Wednesday, a German Patent Office spokeswoman said the application was received on October 30, 2007 and published 18 months later, as required by law, in a patents database. But inventions that are unethical or a danger to the public are not recognized.

Reporters said the document proposed that tiny semiconductors be implanted or placed by injection under the skin of people so their whereabouts could be tracked by global-positioning satellites. This could be used to prevent immigrants overstaying.

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A model B of the system would contain a poison such as cyanide, which could be released by remote control to “eliminate” people if they became a security risk. The document said this could be used against terrorists or criminals.

Microchip implantation in humans has raised new ethical discussions by scientific professional forums, academic groups, human rights organizations, government departments and religious groups.

The Council on Ethical and Judicial Affairs (CEJA) of the American Medical Association published a report in 2007 alleging that RFID implanted chips may compromise privacy because there is no assurance that the information contained in the chip can be properly protected, notwithstanding health risks (chips can travel under the skin).